I have figured out how to unwrap my objects is there a way to label which side is which?
Color-mapping.

What is color-mapping?

You create some materials with different colors (red, green, orange, yellow, blue, etc).
You then apply the different colors to different parts of your model. 

How you do that?


go into editmode
select the part of your mesh you want to assign the color to
(with the part selected) go to you materials and click assign
the color should now be assigned to the part of your mesh. 
this method is pretty comon
after this, create a new image in the image-viewer
go to your render tab
scroll down to bake and select "colors" or "textures" (i dont know
which of both right now^^)


you now have a colored texture, which you could for example use in Photoshop. For example you want some parts of your model to have a metal texture. Pick a color for the parts, bake the map, in Photoshop "select color" and bam, you have the perfect part oif your uv-map selected ^^